World Wide Web
(WWW) The subset of the Internet capable of providing the public with user-friendly graphics-based multi-media access to information on the Internet. It is the most popular means for storing and linking Internet-based information in all multi-media formats. Navigation is accomplished through a set of linked documents that may reside on the same computer or on computers located almost anywhere else in the world.

Source:
DoD Web Policy - Amended. Web Site Administraton Policies & Procedures of November 25, 1998 With Amendments and Corrections incorporated... (latest corrections from 11 January 2002).